Knob



FIG. 1 is a top perspective view of a knob showing the new design.

FIG. 2 is a top plan view of the design.

FIG. 3 is a front elevation view of the design. The rear elevation view is identical thereto; and,

FIG. 4 is a bottom plan view of the design.

The right side and the left side elevation views are identical to the front elevation view.

The broken line disclosure in the Figures is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a knob, as shown and described. 